Hi Scott, kicking my self for not getting across for this. One of our local speedies attended and looks like he had a great weekend.
9m and 10m in light under cooked conditions: Select Ghost 57cm from 8 knots to 12 knots. Allows for OK angles.
9m and 10m in powered up conditions: Select RS7 51cm from 12 knots to 20 knots (some times more). Perfect for me, peak GPS speeds around 32/33k and loads of control through chop.
9m in over powered conditions: Select SuperFast 48cm from 20 knots upwards (but usually opt for a sleeker board by this time
I tried a Select RS7 41cm and a Select Viper 43cm on the iS144 in poweed up conditions, but it was to small, OK downwind, crap upwind.
8m and 9m in under cooked conditions: Select Viper 43cm from 10 knots to 12 knots.
8m and 9m in powered up conditions: Select RS7 41cm from 15 knots to 25 knots. Great fun in this range with GPS peaks at mid thirty knots.
8m over powered conditions: Select RS7 38cm from 20 knots upwards. Only tried this a few times, works ok if you have not taken a smaller board with you.
The Select fins are not has powerfull as the Drake R13, so you could go 1cm smaller on each size. Also, Im 105kg so usually take a slightly bigger fin.
I know that there are better fins than Select or Drake R13, but for fun sailing or non-pro racing, its hard to justify buying a two or three of the more expensive fins for each board. Would require a small mortgage to do so
Noticed your getting rid of the iS76, whats going to replace it?